$(a)$ Explain the phenomenon of scattering of light. State the factor on which the colour of scattered light depends.
$(b)$ List any two natural phenomena based on the scattering of light.

(N/A) Scattering of light is the phenomenon where light rays change their direction upon striking obstacles such as atoms,molecules,dust particles,or water droplets. The colour of the scattered light depends on the size of the scattering particles. Very fine particles scatter mainly blue light of shorter wavelengths,while larger particles scatter light of longer wavelengths.
$(b)$ Two natural phenomena based on the scattering of light are:
$(i)$ The blue colour of the sky.
$(ii)$ The reddish appearance of the Sun at sunrise and sunset.